Create a glossary for Falco terms

[aijamalnk]

/area documentation

What would you like to be added:

• Improve understanding of Falco content - should be understandable by someone that doesn’t know C++, anything about the kernel
• Provide references for individuals to learn more about eBFP, kernel security, syscalls, and more.

Why is this needed:
users need a good context about Falco terms.

Tasks

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1. Define and add references for syscalls
2. Define and add references for Kernel
3. Kernel space and user space
4. Define and add references for alerts
5. Define and add references for gRPC
6. Define and add references for Runtime Security
7. Define and add references for plugins
8. Define and add references for extractors
9. Define and add references for sources
10. Define and add references for drivers
11. Define and add references for eBPF
12. Define and add references for probe
13. Define and add references for module
14. Define and add references for rule
15. Define and add references for rules file
16. Define and add references for macro
17. Define and add references for condition
18. Define and add references for list
19. Define and add references for output
20. Define and add references for rule fields
21. Define and add references for ring buffer
22. Define and add references for exporter
23. Define and add references for event generator
24. Define and add references for priority
25. Define and add references for tags
26. Define and add references for exceptions